Half to john lloyd



(No Model H. G. OSTERBERG.

PIANOFORTE ACTION.

No. 585,398. Patented June 29,1897

UNITED STATES PATENT OFFICE.

HANS G. OSTERBERG, OF BOSTON, MASSACHUSETTS, ASSIGNOR OF ONE- HALF TO JOHN LLOYD, OF SAME PLACE.

PlANOFORTE-ACTION.

SPECIFICATION forming part of Letters Patent No. 585,398, dated June 29, 1897'.

Application filed February 12,1897. Serial No. 623,168. (No model.)

To all whom it 'ITLftZ/ concern.-

Be it known that I, HANS G. OSTERBERG, of Boston, in the county of Sufiolk and State of Massachusetts, have invented a new and useful Improvement in Pianoforte-Actions, of which the following, taken in connection with the accompanying drawings,is a specification.

My invention relates to an improvementin that class of actions known as Swiss ac tions 5 and it consists in an improved mechanism to take the place of the under hammer and its connecting parts, the object being to simplify this part of a pianoforte-action and to make a reliable and inexpensive action. This object I attain by the mechanism shown in the accompanying drawings, in which- Figure 1 shows a pianoforte-action having my improvements,all of the parts being shown as they stand when the hammer is down or at rest. Fig. 2 shows the same parts as in Fig. 1, but in this figure the parts are shown as they stand just after the blow has been struck and before the hammer and its connections have returned to their resting positions.

In the drawings, A represents an ordinary key, and A its pivot or fulcrum. The key A has an adjustable striker A and a back-stop B. These parts are of the ordinary construction used in the grand piano.

The rail D has a flange D, to which is pivoted a jack O, having a downward projection 0 which forms a contact-piece for the adjustable striker A A jack-fly J J 2 is pivoted to the jack O at J. The end J of the jackfly is adapted to come in contact with the regulating-button K by which its motion is limited.

S is a spring attached to the projection O" on the jack O and is connected to the jackfly by a loop S, its function being to draw the upper end of the jack-fly J backward, so that it may be in position to operate on the boss L of the hammer-stem. A pad J is at tached to the jack-fly near its upper end, as shown. This pad comes in contact with the adjustable springing arm H 1-1. This arm H H is attached to the projection O on the jack 0, and the exact position of its end H is determined by the regulating-button E, connected to the bracket-piece E. The point H is adapted to yield slightly, so as to enable the hammer to fall sufficiently to engage with the backstop B. tached to the fixed rail K and serves to limit the forward motion of the jack-fly.

The jack 0 has at its end a cushion O which receives the hammer-stem L as it falls back into its resting position, as shown in Fig. 1. The hammer L and its stem L,which is pivoted at L to the flange L, as shown, is of ordinary construction and need not be more fully described. The wire is indicated by W.

The operation of my improvements may be set forth as follows: Upon striking the key A the jack 0 and its fly J and springing arm H throw the hammer toward the wire W. As the hammer nears the wire the lower end J 2 of the j ack-fly comes in contact with the regulating-button K throwing the upper end of the jack-fly oif from the boss L. Then the boss L is supported entirely by the point H of the springing arm H, but the force of the rebound of the hammer is suflicient to depress the springing arm and allow the hammer to come in contact with the back-stop 13. Now as the key is released (see Fig. 2) the springing arm H will lift the hammer, so as to al-- low the upper end of the jack-fly to come in contact with the boss L thereby giving a perfect repeat. Without this device of the springing arm working with the j ack-fly a repeating action could not be executed.

I claim- In a pianoforte-action, the combination of a jack O having a projection O and attached thereto an adj ustable spring H provided with a point H and a bent end H a flange E and a regulating-button E adapted to set the spring H to any desired position; with the boss L on the hammerstem, and jack-fly J, having a cushion-pad J attached to its upper end, and adapted to come in contact with the end H of the said spring H substantially as and for the purpose set forth.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, on this 11th day of February, A. D. 1897.

HANS G. OSTERBERG.

Witnesses:

FRANK G. PARKER, FRANK G. HATTIE.

Kis an adjustable rail at- 

